Liquid Ass should be in the list. Orginally invented as a novelty prank item, it smells so bad that it is used to train surgeons and combat medics on abdominal

Liquid Ass should be in the list. Orginally invented as a novelty prank item, it smells so bad that it is used to train surgeons and combat medics on abdominal wounds and procedures that risk puncturing the intestine.